net/mlx5: E-Switch, Use the correct error check on returned pointers

The mlx5 flow-steering API (mlx5_create_flow_table/group/rule) never
returns null pointer on error. Even if it was doing that, checking
for IS_ERR_OR_NULL(p) and then returning PTR_ERR(p) would have cause
bugs, since PTR_ERR(NULL) --> success, crash.

To make things more robust and protect against related future bugs,
convert all IS_ERR_OR_NULL checks on returned values to IS_ERR.

Fixes: 5742df0f7dbe ('net/mlx5: E-Switch, Introduce VST vport ingress/egress ACLs')
Fixes: 86d722ad2c3b ('net/mlx5: Use flow steering infrastructure for mlx5_en')
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reported-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 5374796..a350af2 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -383,7 +383,7 @@ __esw_fdb_set_vport_rule(struct mlx5_eswitch *esw, u32 vport, bool rx_rule,
                                   match_v,
                                   MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,
                                   0, &dest);
-       if (IS_ERR_OR_NULL(flow_rule)) {
+       if (IS_ERR(flow_rule)) {
                pr_warn(
                        "FDB: Failed to add flow rule: dmac_v(%pM) dmac_c(%pM) -> vport(%d), err(%ld)\n",
                         dmac_v, dmac_c, vport, PTR_ERR(flow_rule));
@@ -457,7 +457,7 @@ static int esw_create_fdb_table(struct mlx5_eswitch *esw, int nvports)
 
        table_size = BIT(MLX5_CAP_ESW_FLOWTABLE_FDB(dev, log_max_ft_size));
        fdb = mlx5_create_flow_table(root_ns, 0, table_size, 0);
-       if (IS_ERR_OR_NULL(fdb)) {
+       if (IS_ERR(fdb)) {
                err = PTR_ERR(fdb);
                esw_warn(dev, "Failed to create FDB Table err %d\n", err);
                goto out;
@@ -474,7 +474,7 @@ static int esw_create_fdb_table(struct mlx5_eswitch *esw, int nvports)
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, table_size - 3);
        eth_broadcast_addr(dmac);
        g = mlx5_create_flow_group(fdb, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create flow group err(%d)\n", err);
                goto out;
@@ -489,7 +489,7 @@ static int esw_create_fdb_table(struct mlx5_eswitch *esw, int nvports)
        eth_zero_addr(dmac);
        dmac[0] = 0x01;
        g = mlx5_create_flow_group(fdb, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create allmulti flow group err(%d)\n", err);
                goto out;
@@ -506,7 +506,7 @@ static int esw_create_fdb_table(struct mlx5_eswitch *esw, int nvports)
        MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, table_size - 1);
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, table_size - 1);
        g = mlx5_create_flow_group(fdb, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create promisc flow group err(%d)\n", err);
                goto out;
@@ -1060,7 +1060,7 @@ static void esw_vport_enable_egress_acl(struct mlx5_eswitch *esw,
                return;
 
        acl = mlx5_create_vport_flow_table(root_ns, 0, table_size, 0, vport->vport);
-       if (IS_ERR_OR_NULL(acl)) {
+       if (IS_ERR(acl)) {
                err = PTR_ERR(acl);
                esw_warn(dev, "Failed to create E-Switch vport[%d] egress flow Table, err(%d)\n",
                         vport->vport, err);
@@ -1075,7 +1075,7 @@ static void esw_vport_enable_egress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 0);
 
        vlan_grp = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(vlan_grp)) {
+       if (IS_ERR(vlan_grp)) {
                err = PTR_ERR(vlan_grp);
                esw_warn(dev, "Failed to create E-Switch vport[%d] egress allowed vlans flow group, err(%d)\n",
                         vport->vport, err);
@@ -1086,7 +1086,7 @@ static void esw_vport_enable_egress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, 1);
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 1);
        drop_grp = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(drop_grp)) {
+       if (IS_ERR(drop_grp)) {
                err = PTR_ERR(drop_grp);
                esw_warn(dev, "Failed to create E-Switch vport[%d] egress drop flow group, err(%d)\n",
                         vport->vport, err);
@@ -1174,7 +1174,7 @@ static void esw_vport_enable_ingress_acl(struct mlx5_eswitch *esw,
                return;
 
        acl = mlx5_create_vport_flow_table(root_ns, 0, table_size, 0, vport->vport);
-       if (IS_ERR_OR_NULL(acl)) {
+       if (IS_ERR(acl)) {
                err = PTR_ERR(acl);
                esw_warn(dev, "Failed to create E-Switch vport[%d] ingress flow Table, err(%d)\n",
                         vport->vport, err);
@@ -1192,7 +1192,7 @@ static void esw_vport_enable_ingress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 0);
 
        g = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create E-Switch vport[%d] ingress untagged spoofchk flow group, err(%d)\n",
                         vport->vport, err);
@@ -1207,7 +1207,7 @@ static void esw_vport_enable_ingress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 1);
 
        g = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create E-Switch vport[%d] ingress untagged flow group, err(%d)\n",
                         vport->vport, err);
@@ -1223,7 +1223,7 @@ static void esw_vport_enable_ingress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 2);
 
        g = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create E-Switch vport[%d] ingress spoofchk flow group, err(%d)\n",
                         vport->vport, err);
@@ -1236,7 +1236,7 @@ static void esw_vport_enable_ingress_acl(struct mlx5_eswitch *esw,
        MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 3);
 
        g = mlx5_create_flow_group(acl, flow_group_in);
-       if (IS_ERR_OR_NULL(g)) {
+       if (IS_ERR(g)) {
                err = PTR_ERR(g);
                esw_warn(dev, "Failed to create E-Switch vport[%d] ingress drop flow group, err(%d)\n",
                         vport->vport, err);
@@ -1363,7 +1363,7 @@ static int esw_vport_ingress_config(struct mlx5_eswitch *esw,
                                   match_v,
                                   MLX5_FLOW_CONTEXT_ACTION_ALLOW,
                                   0, NULL);
-       if (IS_ERR_OR_NULL(vport->ingress.allow_rule)) {
+       if (IS_ERR(vport->ingress.allow_rule)) {
                err = PTR_ERR(vport->ingress.allow_rule);
                pr_warn("vport[%d] configure ingress allow rule, err(%d)\n",
                        vport->vport, err);
@@ -1380,7 +1380,7 @@ static int esw_vport_ingress_config(struct mlx5_eswitch *esw,
                                   match_v,
                                   MLX5_FLOW_CONTEXT_ACTION_DROP,
                                   0, NULL);
-       if (IS_ERR_OR_NULL(vport->ingress.drop_rule)) {
+       if (IS_ERR(vport->ingress.drop_rule)) {
                err = PTR_ERR(vport->ingress.drop_rule);
                pr_warn("vport[%d] configure ingress drop rule, err(%d)\n",
                        vport->vport, err);
@@ -1439,7 +1439,7 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
                                   match_v,
                                   MLX5_FLOW_CONTEXT_ACTION_ALLOW,
                                   0, NULL);
-       if (IS_ERR_OR_NULL(vport->egress.allowed_vlan)) {
+       if (IS_ERR(vport->egress.allowed_vlan)) {
                err = PTR_ERR(vport->egress.allowed_vlan);
                pr_warn("vport[%d] configure egress allowed vlan rule failed, err(%d)\n",
                        vport->vport, err);
@@ -1457,7 +1457,7 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
                                   match_v,
                                   MLX5_FLOW_CONTEXT_ACTION_DROP,
                                   0, NULL);
-       if (IS_ERR_OR_NULL(vport->egress.drop_rule)) {
+       if (IS_ERR(vport->egress.drop_rule)) {
                err = PTR_ERR(vport->egress.drop_rule);
                pr_warn("vport[%d] configure egress drop rule failed, err(%d)\n",
                        vport->vport, err);